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Before opening any position, every trader has to determine whether to open a BUY or SELL position. If you want to buy the base currency and sell the quoted currency, this means that you are expecting the base currency to rise so as to sell it back at higher price. Such positions are used to be known as Long positions. In contrast, if you want to sell the base currency for buying a quote currency, this means that you want the base currency to fall in price so as to buy it at a lower price. Such positions are known to be as Short positions. So, keep in mind, that Buy=Long and Sell=Short.